diff options
| author | Eric Dumazet <edumazet@google.com> | 2025-02-07 13:58:36 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-02-10 18:09:09 -0800 |
| commit | a42b69f692165ec39db42d595f4f65a4c8f42e44 (patch) | |
| tree | 595c21de7998c410a6e3f02ab7ebfa79e0b559b2 /net | |
| parent | becbd5850c03ed33b232083dd66c6e38c0c0e569 (diff) | |
arp: use RCU protection in arp_xmit()
arp_xmit() can be called without RTNL or RCU protection.
Use RCU protection to avoid potential UAF.
Fixes: 29a26a568038 ("netfilter: Pass struct net into the netfilter hooks")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250207135841.1948589-5-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/arp.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c index cb9a7ed8abd3..f23a1ec6694c 100644 --- a/net/ipv4/arp.c +++ b/net/ipv4/arp.c @@ -659,10 +659,12 @@ static int arp_xmit_finish(struct net *net, struct sock *sk, struct sk_buff *skb */ void arp_xmit(struct sk_buff *skb) { + rcu_read_lock(); /* Send it off, maybe filter it using firewalling first. */ NF_HOOK(NFPROTO_ARP, NF_ARP_OUT, - dev_net(skb->dev), NULL, skb, NULL, skb->dev, + dev_net_rcu(skb->dev), NULL, skb, NULL, skb->dev, arp_xmit_finish); + rcu_read_unlock(); } EXPORT_SYMBOL(arp_xmit); |